Rather quickly I recognized that what he probably should do is replace the black hole as a means for rapid interstellar travel with a wormhole.
I see no way to escape the conclusion that similar foam-like structure is developing in space and time.
I like to think of space and time as analogous to the ocean, and changes in it as analogous to waves on the surface of the ocean, but those waves, of course, don’t show up when one’s miles above the ocean. It looks flat. Then as one gets down closer to the surface one sees the waves breaking (and the foam).
Let’s suppose that I have a wormhole with one mouth here and the other mouth over there. Now there are three different possibilities for how time could be hooked up through the interior of that wormhole. The first is that when I stick my arm into this mouth it came out over there simultaneously. The second possibility is that when I stick my arm into this mouth it comes out over there only after some delay, and the third possibility is that if I go into this wormhole mouth then I come out over there before I ever even go in. Let’s just see that.
